1982 ish. Brize, base hangar. Was doing an airframe repair on stubwing, 16ft plus a/c on jacks. Fell off, landed on hangar floor and broke both wrists, elbo and cheekbone after doing a back-flip. Funny old thing, the staging was modified soon after? Bless the lads, they painted one off them dead men on the floor where I landed! (the GS I had with me was never found?)
I was about when the guy got his head smashed by a spoiler, though never saw it.